Just to give a good example of not being able to out-exercise or out-drug a poor diet, I once burned off 600 calories on an elliptical machine. It took me about 40 minutes and was a VERY good work out for the cardiovascular system! However, had I then gone out afterwards and eaten a Whopper WITHOUT Cheese, I would have consumed 636 calories in that one burger. 40 minutes of hard work would have vanished in 5 minutes of eating...and I most likely would have had fries and a large soda with it...